Answer:
The formula for a quadrilateral depends on the shape.
Area of a Parallelogram: Base × Height
Area of a Rectangle: Length × Breadth
Area of a Square: (side)^2
Area of a Kite: (1 ⁄ 2) × Product of Diagonals
Area of a Trapezoid: (base1+base2/2) x Height
I hope this helps :)